The fastest way to whiten teeth is in-surgery whitening at the dentist, which can lighten teeth in one appointment. At home, an LED kit is the quickest option: the SmilePro Advanced Kit whitens teeth up to 8 shades in 7 days with one 10-minute treatment a day, and most customers see a noticeable difference after the first treatment.
Whitening strips take longer per treatment and whitening toothpaste only helps with surface stains. Here is how each method compares on speed, and how to get the fastest safe result at home before a wedding, a job interview or a holiday.
How fast can you whiten your teeth?
| Method | How it is used | Result |
|---|---|---|
| In-surgery whitening at the dentist | One appointment, usually around 1 to 2 hours | Whiter teeth after one visit; a private dental fee |
| SmilePro Advanced Kit (LED) | 10 minutes a day for 7 days | Up to 8 shades in 7 days |
| SmilePro Teeth Whitening Strips | 30 minutes a day for 7 days | Up to 5 shades whiter |
| Whitening toothpaste | Brushing twice a day | Helps lift surface stains; best for maintenance |
Can you whiten your teeth in one day?
Only at the dentist. In-surgery whitening can lighten teeth in a single appointment. At home, the full result takes a 7-day course, but most SmilePro kit customers see a noticeable difference after the first 10-minute treatment, and 93% saw results after first use.
How to get the fastest results at home
Do one treatment every day for 7 days without skipping, and follow the instructions exactly. With the SmilePro kit, you can run up to three 10-minute cycles (30 minutes) in one session, without adding more gel for a stronger result. Faster never means longer or more often than directed.
- Start with clean teeth: brush with water first.
- Paint a thin, even layer of gel; more gel does not mean faster results, it just spreads onto your gums.
- Use the blue and red LED settings together. The gel is always used with the light.
- Do your treatment in the evening, when it is easy to fit in every day.
- After each treatment, wait 1 hour before eating or drinking anything except water.
- Wait at least 30 minutes before brushing after a treatment.
What does not whiten teeth fast?
Whitening toothpaste helps lift everyday surface stains, but it is best for maintenance rather than a big change in shade. DIY remedies such as baking soda, charcoal or lemon are not a shortcut either; speak to a dentist before trying anything that is not made for whitening.
How to plan your whitening before an event
| When | What to do |
|---|---|
| 2 weeks or more before | Start your 7-day SmilePro course, so you finish with time to spare |
| 7 days before (at the latest) | Start your course if you have not already, one 10-minute treatment a day |
| The week of the event | If you finished your course earlier, do a 10-minute top-up |
| The day before | Brush as usual and rinse with water after coffee, tea or red wine |
| On the day | Brush as usual and smile |
Is it safe to whiten your teeth faster?
Only within the instructions. Do one session a day, with no more than three 10-minute cycles in a session, never leave strips on for longer than 30 minutes, and do not use whitening products for more than 14 consecutive days without a dentist's supervision. If you feel discomfort, stop, rinse and pause your course.
How do you keep your teeth white after a fast whitening course?
A 10-minute top-up every 2 weeks keeps your result going, or once a week if you drink a lot of coffee, tea or red wine. Refill pens for the kit come in the Whitening Pen Pack, and work with the light you already have.
Brushing every day with SmilePro Whitening Toothpaste helps lift everyday surface stains between top-ups.
Who should not whiten their teeth?
SmilePro whitening products are not for anyone under 18, or anyone pregnant or breastfeeding. Do not use them if you have gum disease, an oral infection or recent dental surgery, or amalgam fillings without consulting a dentist first. If you have sensitive teeth or unhealthy gums, see a dentist first.
Shop the SmilePro Advanced Teeth Whitening Kit: up to 8 shades in 7 days →
Read next: Whitening strips vs LED kit, Teeth whitening aftercare, Teeth whitening before and after and Whitening kit vs whitening toothpaste.
Sources
This guide is general information, not dental advice. If you have any concerns about your teeth or gums, speak to a dentist.
- NHS, Teeth whitening (in-surgery whitening is usually 1 appointment of around 1 to 2 hours), page reviewed 19 August 2025.
- SmilePro product information: Advanced Teeth Whitening Kit, Teeth Whitening Strips, and our Terms and Conditions.
Last updated: 7 October 2026.
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